FastTrack gets you quick through security check and to the deparure lounge (must be booked before 10pm the day before travel.

While WiFi is available free for 30 - 70 mins, Premium service is available on a pay-as-you-go option (L5/hr; L10/day or L30/month).
SSID's: inside airport 'spectrum' or MAG Airports WiFi; at BA lounge 'BA lounge wifi'; at Servisair lounge: 'Servisair'.